updated neccessary folders to create during installation

README.md

@@ -61,12 +61,9 @@ To check the records: https://kingant.net/check_xmpp_dns/
  1. Prepare data folders with proper permissions.
     ```
     inst_dir=/opt/docker/ejabberd
-    mkdir -p $inst_dir/data/conf \
-             $inst_dir/data/database \
+    mkdir -p $inst_dir/data/database \
              $inst_dir/data/backup \
              $inst_dir/data/upload \
-             $inst_dir/data/cron \
-             $inst_dir/data/www \
     && chown -R 9000:9000 $inst_dir/data/
     
     mkdir -p $inst_dir/data/biboumi/database